| Cutting Edge Saloon Ltd | Other services | 2022 |
| CWH Business Ltd | Real estate | 2020 |
| CY Engineering & Consultancy Ltd | Professional & scientific | 2019 |
| Cyberia Limited | Information & communication | 2000 |
| Cybermindr UK Ltd | Information & communication | 2026 |
| Cyke Global Ltd | Information & communication | 2010 |
| Cynon Sonkkila Technologies Ltd | Information & communication | 2022 |
| D & a Imaging Limited | Wholesale & retail | 2004 |
| D & M Building Roofing & Maintenance Ltd | Construction | 2000 |
| D & M Tools Holdings Limited | Financial services | 2026 |
| D & M Tools Limited | Wholesale & retail | 2015 |
| D & N Launderette (Wimbledon) Ltd | Other services | 2024 |
| D&A Vape Ltd | Wholesale & retail | 2020 |
| D&E Jointing Services Ltd | Construction | 2025 |
| D&L Consultancy Limited | Professional & scientific | 2019 |
| DA Toos Ltd | Professional & scientific | 2025 |
| Da&P Limited | Administrative & support | 2022 |
| Daily Crepe Ltd | Hospitality | 2025 |
| Daily Sport Limited | Other services | 2011 |
| Daisies and Dinosaurs Limited | Wholesale & retail | 2016 |
| Daisy Roots Parental Solutions Ltd | Education | 2016 |
| Dale Avenue Limited | Households | 2025 |
| Dalekosoft Limited | Information & communication | 2016 |
| DAM Testing Limited | Professional & scientific | 2014 |
| Damas Jasmine Ltd | Real estate | 2024 |
| DAN Douglass Creative Ltd | Administrative & support | 2016 |
| Dancey Consulting Limited | Professional & scientific | 2025 |
| Dandelion Dreamworks Limited | Professional & scientific | 2026 |
| Danielle Carreira Limited | Professional & scientific | 2019 |
| Danielle Gladstone Limited | Administrative & support | 2015 |
| Daphne London Limited | Professional & scientific | 2018 |
| Darling Signs Ltd | Manufacturing | 1965 |
| Darlow Technology Ltd | Professional & scientific | 2020 |
| Darsden & Co Limited | Transport & logistics | 2026 |
| Darshana Sharma and Company Ltd | Wholesale & retail | 2018 |
| Dashmartini Limited | Information & communication | 2014 |
| Data Alliance Ltd | Information & communication | 2003 |
| Data Lens Labs Ltd | Information & communication | 2020 |
| Datchet Corp Ltd | Real estate | 2021 |
| Datchet JA Ventures Limited | Financial services | 2026 |
| Dato Music Limited | Arts & recreation | 2023 |
| Daughters of Eden Productions Limited | Information & communication | 2020 |
| David & Co Consulting Limited | Professional & scientific | 2020 |
| David Bedford & Associates Ltd | Professional & scientific | 2018 |
| David Blacklock Ltd | Manufacturing | 2019 |
| David Fairway & Associates Limited | Information & communication | 2009 |
| David Harriott Williams Limited | Construction | 2015 |
| Davies OIL & GAS Management Advisory Limited | Professional & scientific | 2017 |
| Dawson Insight Ltd | Professional & scientific | 2019 |
| Dayacorp Ltd | Financial services | 2025 |
| Dayfresh Ltd | Hospitality | 2012 |
| Daylight Robbery Limited | Information & communication | 2013 |
| Dayowell Ltd | Professional & scientific | 2026 |
| DB Group International Ltd | Wholesale & retail | 2023 |
| DBR QP Services Limited | Professional & scientific | 2013 |
| Dcgpac UK Limited | Administrative & support | 2025 |
| DCS Accounts Ltd | Professional & scientific | 2015 |
| Ddaad Properties Limited | Real estate | 2024 |
| DDZ Art Services Ltd | Administrative & support | 2020 |
| Deadspot Ltd. | Information & communication | 2026 |
| Dealframe Advisory Ltd | Professional & scientific | 2025 |
| Debarry Ltd | Construction | 2026 |
| Declension Systems Limited | Information & communication | 2009 |
| Decor Goods Limited | Wholesale & retail | 2026 |
| Dedigama Holdings Ltd | Hospitality | 2020 |
| Dedigama Motoring Centre Ltd | Wholesale & retail | 2022 |
| Dedigama Properties Ltd | Hospitality | 2022 |
| Deeming Property LLP | | 2021 |
| Deep Digital Limited | Other services | 2014 |
| Deep Syncers Music Ltd | Information & communication | 2020 |
| Deepcircle Ltd | Wholesale & retail | 2025 |
| Deepdive Consulting Limited | Professional & scientific | 2018 |
| Dela Torre Construction Limited | Construction | 2025 |
| Delfort Properties Ltd | Real estate | 2023 |
| Delil London Limited | Professional & scientific | 2021 |
| Delirarium Design Studio Limited | Information & communication | 2022 |
| Delises Entertainment Limited | Wholesale & retail | 2017 |
| Dellon Ltd | Wholesale & retail | 2024 |
| Deluxe Driveways and Patios Ltd | Administrative & support | 2025 |
| Demolition Logistics Limited | Construction | 2009 |
| Demyst Ltd | Real estate | 2011 |
| Denatium Limited | Wholesale & retail | 2019 |
| Dendil Properties Limited | Real estate | 2018 |
| Denova Glosoft Limited | Information & communication | 2020 |
| DEP ACT 2 Limited | Households | 2019 |
| DEP ACT Ltd | Construction | 2016 |
| DER Schnitt Post Production Ltd | Information & communication | 2018 |
| Derek Ridgers Limited | Professional & scientific | 2009 |
| Derma Constructions Ltd | Construction | 2018 |
| Dermaful Ltd | Health & social care | 2022 |
| Derwent Developers Ltd | Construction | 2013 |
| DES4D Ltd | Professional & scientific | 2025 |
| Design and Create Furniture Limited | Professional & scientific | 2021 |
| Design and Refine Ltd | Professional & scientific | 2024 |
| Design INNOV8 Limited | Administrative & support | 2008 |
| Designed by Jujubeng Ltd | Professional & scientific | 2021 |
| Designer IP Ltd | Professional & scientific | 2013 |
| Detox Your Mind Limited | Education | 2021 |
| Devboxremote Limited | Information & communication | 2022 |
| Devcube Software Limited | Information & communication | 2016 |